Fix venv requirement of power graph action/power update

.forgejo/workflows/power-graph.yml

@@ -2,10 +2,8 @@ name: Generate Power Graph
 
 on:
   push:
-    branches:
-      - master
-    paths:
-      - power_log.csv
+    branches: [ master ]
+    paths: [ power_log.csv ]
 
 jobs:
   plot:
@@ -19,15 +17,19 @@ jobs:
           git clone --branch "$BRANCH" https://${{ secrets.PAT_READ_REPO }}@mentalnet.xyz/forgejo/markmental/amd-monitor.git .
           echo "✅ Checked out branch $BRANCH ($COMMIT)"
 
-      - name: Install Python dependencies
+      - name: Install Python and deps (venv)
         run: |
-          apt update
-          apt install -y python3 python3-pip
-          pip3 install matplotlib pandas
+          apt-get update
+          apt-get install -y python3-full python3-venv
+          python3 -m venv venv
+          . venv/bin/activate
+          pip install --upgrade pip
+          pip install matplotlib pandas
 
       - name: Generate power graph
         run: |
-          python3 plot_power.py
+          . venv/bin/activate
+          python plot_power.py
 
       - name: Upload graph artifact
         uses: actions/upload-artifact@v3

power_log.csv

@@ -326,3 +326,13 @@ timestamp,apu_w,gpu_w,total_w,apu_temp,gpu_temp
 2025-11-05T18:20:41-05:00,51.14,9.00,60.14,71.0,67.0
 2025-11-05T18:20:42-05:00,1.06,9.00,10.06,71.0,67.0
 2025-11-05T18:20:43-05:00,41.18,9.00,50.18,72.0,67.0
+2025-11-05T18:25:32-05:00,56.08,9.00,65.08,71.0,67.0
+2025-11-05T18:25:33-05:00,50.13,9.00,59.13,72.0,67.0
+2025-11-05T18:25:34-05:00,63.19,10.00,73.19,71.0,67.0
+2025-11-05T18:25:35-05:00,59.04,9.00,68.04,71.0,67.0
+2025-11-05T18:25:36-05:00,48.04,9.00,57.04,71.0,67.0
+2025-11-05T18:25:37-05:00,50.13,9.00,59.13,71.0,67.0
+2025-11-05T18:25:38-05:00,61.03,9.00,70.03,71.0,67.0
+2025-11-05T18:25:39-05:00,64.01,9.00,73.01,74.0,67.0
+2025-11-05T18:25:40-05:00,12.23,9.00,21.23,71.0,67.0
+2025-11-05T18:25:41-05:00,4.06,9.00,13.06,71.0,67.0